drm/i915/selftests: Use a single copy of the mocs table

Instead of copying the whole table to each category (mocs, l3cc), use a
single table with a pointer to it if the category is enabled.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210201100448.9802-1-chris@chris-wilson.co.uk


Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>